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10 July 2020 Bacidia gigantensis (Ramalinaceae), a new species with homosekikaic acid from the north shore of Lake Superior in Ontario, Canada
R. Troy McMullin, Bruce McCune, James C. Lendemer
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Abstract

Bacidia gigantensis, a green to greenish-brown, sorediate, crustose to microsquamulose lichen is described as new to science. It is corticolous on mature Thuja occidentalis trees throughout Sleeping Giant Provincial Park on the Sibley Peninsula along the north shore of Lake Superior, Ontario. The species is unusual within Bacidia due to the production of asexual propagules and homosekikaic acid. Placement in Bacidia is based on the characters of the sexual reproductive structures (biatorine apothecia with a true exciple, Bacidia-type asci, and sigmoid, acicular, ascospores), ITS sequence data and molecular phylogenetic analyses of mtSSU sequence data. The latter also inferred a relationship to Bacidiopsora, a tropical genus that has been proposed for synonymy with Bacidia and includes other species with similar chemistries.

Copyright ©2020 by The American Bryological and Lichenological Society, Inc.
R. Troy McMullin, Bruce McCune, and James C. Lendemer "Bacidia gigantensis (Ramalinaceae), a new species with homosekikaic acid from the north shore of Lake Superior in Ontario, Canada," The Bryologist 123(2), 215-224, (10 July 2020). https://doi.org/10.1639/0007-2745-123.2.215
Received: 18 March 2020; Accepted: 7 May 2020; Published: 10 July 2020
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